I've had great luck with Hydrogen Peroxide on copper coins.
Yours looks to be the soft type of green gunk, so it should come out pretty easy with a soak.
I can't tell you how long it will take, but as a rule of thumb I check a soaking copper about every 15 minutes.
Also, I find shot glasses make very nice cleaning containers.
Oh, if you have a coin that has the green stuff impregnated into the metal within the details, don't bother soaking it.
If you do, it will eat away details and all.
It is best to leave the coin the way it is.
I learned the hard way.
I hope that helps a little.
... I used coppercoins.com and believe it is RPM 1954d-1mm-001 not valuable by any means, but it was a fun find. My question is, I know cleaning is bad, its the absolute no-no of our hobby, but on a coin such as this where there is no real value, I would like to get this green residue off... I'm new to Lincolns, primarely a Buffalo hunter, but taking a little side journey if you will. So any suggestions on the least harmful way rid the residue from the coin?
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